43 in Roman numerals is XLIII, built from XL + III (XL = 40, III = 3), which add up to 43. It uses subtractive notation: XL (50 - 10).
How 43 is written in Roman numerals
The number 43 is written XLIII in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.
Building XLIII step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| XL | 40 | 43 | 3 |
| I | 1 | 3 | 2 |
| I | 1 | 2 | 1 |
| I | 1 | 1 | 0 |
Where you see XLIII
The 43rd Super Bowl was Super Bowl XLIII; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 43 in Roman numerals?
43 in Roman numerals is XLIII. Reading it left to right gives XL (40) + I (1) + I (1) + I (1) = 43. The number below it, 42, is written XLII, and the number above it, 44, is written XLIV.
How do you write 43 in Roman numerals?
Write 43 as XLIII, combining XL (40) + I (1) + I (1) + I (1). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 43 in 4 steps: XL leaves 3, I leaves 2, I leaves 1, I leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XLIII is the only standard spelling of 43.
Does XLIII use subtractive notation?
Yes, XLIII uses subtractive notation. Here XL means 50 minus 10. Without it, 43 would have to be written XXXXIII, and Roman numerals avoid a run of four identical letters wherever a subtractive pair will do.
How is XLIII read out loud?
XLIII is read as the number it stands for, forty-three, and never letter by letter. Roman numerals are a way of writing values rather than a separate set of names, so the spoken form is the same whether the page shows 43 or XLIII. A chapter or volume numbered XLIII, for instance, is simply chapter forty-three.